Can anybody help my plants?! Current culture

Hi all,

PICTURES ATTACHED
FIRST 4 IMAGES TAKEN 5 DAYS AGO
REMAINING IMAGES TAKEN TAKEN NOW

I am having problems with my dwc grow. Leaves have started to turn lime green on new growth, then has now spread to the middle of the plant!

I thought this was potentially a light bleaching problem, as i had 3 plants not under direct light that weren't showing symptoms.

At this point the PPM was at 470 and PH at 5.9-6.0

It has only gotten worse, so 2 days ago I emptied the system and refilled system PPM at 420 and PH at 5.9 put in .
420ml UC roots
200ml calmag current culture
290ml veg A current culture
290ml veg B current culture.

system info
440L
Current culture nutes
Problems appeared in the last week

Today the system is PPM 420 and 6.0 PH.

I am using current culture nutes. To me looks like nutrient burn, but I am at a loss. I already lost 8 plants last week, I really don't want to lose these.
Have had 2 successful dwc in the past, last one pulled 9P from a 10ft x 10ft tent 2400w LEDs.
 

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you sure your pH meter is accurate?

is the ppm dropping at all?

i would flush w/ plain water for minimum 12 hours. then start back at 1/2 your nute strength
 
pic 183 is the easiest to see. burnt tips. dying leaves.

usually that leads to nute lockout: ppm not dropping, Mg deficiency when you are adding cal/mg, etc.
 
So I flushed my system for 12 hours and refilled it with 320ppm nutrients (about half recommended), but my plants are not showing signs of recovering. They look worse!
 
pic 183 is the easiest to see. burnt tips. dying leaves.

usually that leads to nute lockout: ppm not dropping, Mg deficiency when you are adding cal/mg, etc.


Any recommendations? Plants are starting to go down hill fast.
 

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